Enemies by birth. Allies by necessity. Brothers by choice.

For the first time in his long, barren life, the immortal king Pietas fears the isolation he once accepted as inevitable. Friendship was never part of eternity's bargain?until Six.

Six is mortal. His immortality is temporary, and he refuses to live on anyone else's terms. When it fails, his body will fail with it. No revival. No return. Only a slow, irreversible end.

Pietas has survived exile, betrayal, and endless solitude?but he will not lose his shield brother. Not after what honesty and loyalty have already cost them.

To save Six, Pietas must set aside his pride and work with the enemy who exiled him. Doing so means breaking a vow forged in his darkest hour?a promise of vengeance he has never questioned.

He can preserve a world. He can secure a future. But even if it costs everything?

Pietas will not let Six go.

Watch Your Six - character-driven science fiction novel about loyalty, sacrifice, and the price of refusing to let go.